The Chelsea 890 Series Power Take-Off, part number 890HCFJW-B5AZ or 890HCFJWB5AZ, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mount and delivers an SAE C ("XS") output shaft with wet-spline lubrication to extend pump spline life in demanding service. The one-piece main shaft eliminates the input splines between the PTO body and the output extension, and the clutch is positioned at the rear of the housing so the gear section tucks tightly against the transmission, moving the pump mounting flange rearward for improved clearance. Continuous-duty torque reaches 670 ft-lbs, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial, fire and rescue, refuse, and truck crane work. Call us to confirm proper fit for your specific transmission configuration.
Features
Hydraulic PowerShift (hot-shift) operation for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with rear-positioned pump output flange for improved frame-rail clearance
SAE C ("XS") output shaft with wet-spline lubrication to extend PTO and pump shaft life
One-piece main shaft design - no input splines between PTO body and output extension
Continuous-duty torque rating of 670 ft-lbs; shaft power 64 HP at 500 RPM, 128 HP at 1,000 RPM
Suited for aerial, fire and rescue, refuse, and truck crane applications
Tech Specs
- Transmission Application: Allison 3000 MD Series, Allison 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C ("XS") Output
- Outlet Flange Type: SAE C
- Lubricant/Spline: Wet Spline
- Continuous Torque: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 64 HP (500 RPM), 128 HP (1,000 RPM)
- Input Gear Designator: FJ (Allison 3000 MD and 4000 HD Series)
Additional Information
The Chelsea 890 Series is a single-unit PTO - not a PTO paired with a separate extension. By positioning the clutch at the rear of the housing, the gear section sits tightly against the transmission body, locating the pump output flange further rearward than a conventional side-mount PTO. This layout creates usable clearance between the pump and the frame rail without requiring an external extension tube. The wet-spline output continuously lubricates the mating pump shaft splines, reducing wear in high-cycle or continuous-duty operation. Typical installations include aerial lift trucks, fire and rescue pumpers, refuse packers, and truck cranes where both high torque and pump spacing are critical. The 890 Series accommodates Allison 3000 and 4000 transmissions equipped with or without a cooler, retarder, or both. Part number 890HCFJW-B5AZ is also referenced as SP890HCFJW-B5AZ. Contact Pro Gear and Transmission to verify the correct configuration for your transmission build.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
